Cisco Systems CISCO10720

Cisco 10720 Internet Router Uplink Cards Installation and Configuration

78-13113-06 B0

Preface

Electromagnetic Compliance

Electromagnetic compliance information is presented in the following sections:

•Electromagnetic Compatibility Regulatory Statements, pageix

•Site Wiring Distance and Interference Guidelines, page ix

Electromagnetic Compatibility Regulatory Statements

For regulatory, compliance and safety information, see the Regulatory Compliance and Safety

inforamtion for the Cisco 10720 Internet Router document.

Site Wiring Distance and Interference Guidelines

This section offers site wiring guidelines for setting up the site plant wiring and cabling. When plan ning

the location of the new system, consider the following:

•Electromagnetic Interference, pageix

•Distance Limitations for Signaling and Unshielded Conductors, pagex

Electromagnetic Interference

Electromagnetic interference can occur between the field and the signals on the wires when the wires are

run for any significant distance. This fact has two implications for the construction of plant wiring:

•Poor wiring practice can result in radio interference emanating from the plant wiring .

•Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy and/or cause

interference with the signal drivers and receivers in the Cisco 10720 Internet Router, and can create

an electrical hazard by conducting power surges through lines a nd into equipment.

Note To predict and remedy strong EMI, consult experts in radio frequency interference (RFI).

A good quality twisted pair cable or shielded twisted pair cable helps limit radiation and noise induced

into the cable minimizing:

•Potential for radio interference

•Potential for interference with the data transmission.

Chapter 4 Creating a Four-Node Ring Using

the Uplink Cards

Provides information for creating a four-node

DPT ring using the DPT uplink card or IEEE

802.17 ring using the RPR/SRP uplink card.

Chapter 5 Troubleshooting the Uplink Cards Provides troubleshooting information for

checking the uplink card installation, as well as

alarm message information and solutions to the

problems.

Section Title Description